msg = ("Welcome to {room} @{user}! I'm {me}, a bot that detects spam and offensive posts on the network "
       "and posts alerts to chat. You can find more about me on the [Charcoal website](charcoal-se.org/).")
raise CmdException(msg.format(room=msg.room.name, user=other_user, me=GlobalVars.chatmessage_prefix))

w_msg = ("Welcome to {room}{user}! I'm {me}, a bot that detects spam and offensive posts on the network, "
             "and posts alerts to chat. You can find more about me on the"
             "[Charcoal website](charcoal-se.org/).")
    if other_user is None:
        return w_msg.format(room=msg.room.name, user="", me=GlobalVars.chatmessage_prefix)
    else:
        other_user = regex.sub(r'^@*|\b\s.{1,}', '', other_user)
        raise CmdException(w_msg.format(room=msg.room.name, user=" @" + other_user, me=GlobalVars.chatmessage_prefix))